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Theft Deterrent - Volt

SCHEMATIC WIRING DIAGRAMS

THEFT DETERRENT SYSTEM WIRING SCHEMATICS

Theft Deterrent System

Fig. 1: Theft Deterrent System

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC B291A: CONTENT THEFT DETERRENT ASSEMBLY INTERNAL MALFUNCTION

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptor

DTC B291A 39

Content Theft Deterrent Assembly Internal Malfunction

Circuit/System Description

The body control module performs various internal fault detection test to determine if a software or hardware concern exists within the power sounder. No external circuits are involved.

Conditions for Running the DTC

The vehicle is OFF.

The vehicle is in Park.

Conditions for Setting the DTC

The Body Control Module has detected an internal failure within the Content Theft Deterrent Sensor Module.

Action Taken When the DTC Sets

The intrusion and inclination functionality is disabled.

Conditions for Clearing the DTC

A current DTC is cleared when the conditions for setting the DTC are no longer present. A history DTC will clear after 40 malfunction free vehicle cycles.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle in Service Mode.

2. Verify DTC B291A is not set.

If the DTC is set

Replace the P4 Power Sounder.

If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

DTC B291B: CONTENT THEFT DETERRENT SENSOR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

DTC Descriptors

DTC B291B 00

Content Theft Deterrent Sensor Malfunction

DTC B291B 39

Content Theft Deterrent Sensor Internal Malfunction

DTC B291B 3B

Content Theft Deterrent Sensor Self-Test Malfunction

DTC B291B 42

Content Theft Deterrent Sensor Calibration Not Programmed

DTC B291B 4B

Content Theft Deterrent Sensor Calibration Not Learned

Diagnostic Fault Information

Circuit/System Description

The Body Control Module performs various communication fault detection tests to determine if a software, hardware, or communication concern exists with the Content Theft Deterrent Sensor Module.

Conditions for Running the DTC

The vehicle is OFF.

The vehicle is in Park.

Conditions for Setting the DTC

The Body Control Module cannot establish communications with the Content Theft Deterrent Sensor Module.

Action Taken When the DTC Sets

The intrusion and inclination alarm output is disabled.

Conditions for Clearing the DTC

A current DTC is cleared when the conditions for setting the DTC are no longer present. A history DTC will clear after 40 malfunction-free vehicle cycles.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF and vehicle systems OFF, disconnect the harness connector at the B165 Content Theft Deterrent Sensor Module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the B165 Content Theft Deterrent Sensor Module.

If the test lamp illuminates

5. Vehicle OFF, arm the content theft deterrent system.

6. Test for greater than 4.5 V between the serial data circuit terminal 4 and ground.

If 4.5 V or less

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the serial data circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the serial data circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If greater than 4.5 V

7. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

8. Test for less than 1 V between the B165 Content Theft Deterrent Sensor Module serial data circuit terminal 4 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

9. Replace the B165 Content Theft Deterrent Sensor Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

SYMPTOMS - THEFT DETERRENT

NOTE: The following steps must be completed before using the symptom tables.

1. Perform Diagnostic System Check - Vehicle in order to verify that all of the following are true: There are no DTCs set.

The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following Theft Systems Description and Operation.

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the Theft Deterrent System. Refer to

Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Content Theft Deterrent Malfunction (without UTT or UTP)Content Theft Deterrent Malfunction (with UTP)Content Theft Deterrent Malfunction (with UTT)

Inclination/Intrusion Sensor Malfunction

Theft Deterrent Alarm Malfunction (with UTR)Theft Deterrent Alarm Malfunction (with UTP)

CONTENT THEFT DETERRENT MALFUNCTION (WITHOUT UTT OR UTP)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Circuit/System Description

The content theft deterrent system is a software based system in which the Body Control Module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, and the hood ajar switch, the BCM determines whether a content theft deterrent alarm is warranted. If unauthorized access is being detected, the BCM will pulse the vehicle horn and flash the exterior lamps as a means of theft deterrence.

Diagnostic Aids

The scan tool BCM Content Theft Deterrent Trigger History 1, 2, and 3 parameters can be used to help isolate an intermittent unwanted content theft deterrent alarm. These parameters are a rolling history of the previous three causes of a theft deterrent alarm. If all three parameters are indicating the same alarm trigger, the indicated input should be the starting point when diagnosing an intermittent concern.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle OFF.

2. Verify each indicator/message transitions between the ajar and closed state while opening and closing each vehicle door, hood, and rear compartment.

If the indicator/message does not change

Refer to Door Ajar Indicator Malfunction , Hood Ajar Indicator/Message Malfunction , or

Rear Hatch/Gate Ajar Indicator Malfunction .

If each indicator/message changes

3. Vehicle in Service Mode, completely lower the driver door window and close all vehicle doors, vehicle OFF.

4. Arm the content theft deterrent system by locking the door with the keyless entry transmitter.

5. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Armed.

If not Armed

Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Passive) .

If Armed

6. Without disarming the system, reach in through the open driver window and open the driver door.

7. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Alarm.

If not Alarm

Replace the K9 Body Control Module.

If Alarm

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

CONTENT THEFT DETERRENT MALFUNCTION (WITH UTP)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Circuit/System Description

The content theft deterrent system is a software based system in which the Body Control Module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, and the hood ajar switch, the BCM determines whether a content theft deterrent alarm is warranted. If unauthorized access is being detected, the BCM will pulse the security siren and flash the exterior lamps as a means of theft deterrence.

Diagnostic Aids

The scan tool BCM Content Theft Deterrent Trigger History 1, 2, and 3 parameters can be used to help isolate an intermittent unwanted content theft deterrent alarm. These parameters are a rolling history of the previous three causes of a theft deterrent alarm. If all three parameters are indicating the same alarm trigger, the indicated input should be the starting point when diagnosing an intermittent concern.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle OFF.

2. Verify each indicator/message transitions between the ajar and closed state while opening and closing each vehicle door, hood, and rear compartment.

If the indicator/message does not change

Refer to Door Ajar Indicator Malfunction , Hood Ajar Indicator/Message Malfunction , or

Rear Hatch/Gate Ajar Indicator Malfunction .

If each indicator/message changes

3. Vehicle in Service Mode, completely lower the driver door window and close all vehicle doors, vehicle OFF.

4. Arm the content theft deterrent system by locking the door with the keyless entry transmitter.

5. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Armed.

If not Armed

Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Passive) .

If Armed

6. Without disarming the system, reach in through the open driver window and open the driver door.

7. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Alarm.

If not Alarm

Replace the K9 Body Control Module.

If Alarm

8. Verify the security siren is pulsing.

If the security siren is not pulsing

Refer to Theft Deterrent Alarm Malfunction (with UTP).

If the security siren is pulsing

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

CONTENT THEFT DETERRENT MALFUNCTION (WITH UTT)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Circuit/System Description

The content theft deterrent system is a software based system in which the Body Control Module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, the intrusion/inclination sensor, and the hood ajar switch, the BCM determines whether a content theft deterrent alarm is warranted. If unauthorized access is being detected, the BCM will sound the power sounder and flash the exterior lamps as a means of theft deterrence.

Diagnostic Aids

The scan tool BCM Content Theft Deterrent Trigger History 1, 2, and 3 parameters can be used to help isolate an intermittent unwanted content theft deterrent alarm. These parameters are a rolling history of the previous three causes of a theft deterrent alarm. If all three parameters are indicating the same alarm trigger, the indicated input should be the starting point when diagnosing an intermittent concern.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle OFF.

2. Verify each indicator/message transitions between the ajar and closed state while opening and closing each vehicle door, hood, and rear compartment.

If the indicator/message does not change

Refer to Door Ajar Indicator Malfunction , Hood Ajar Indicator/Message Malfunction , or

Rear Hatch/Gate Ajar Indicator Malfunction .

If each indicator/message changes

3. Vehicle in Service Mode.

4. Verify the intrusion/inclination sensor disable LED turns ON and OFF as the intrusion/inclination sensor disable switch is cycled.

If the LED does not turn ON and OFF

Refer to Inclination/Intrusion Sensor Malfunction.

If the LED turns ON and OFF

5. Completely lower the driver door window and close all vehicle doors, vehicle OFF.

6. Arm the content theft deterrent system by locking the door with the keyless entry transmitter.

7. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Armed.

If not Armed

Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Passive) .

If Armed

8. Without disarming the system, reach in through the open driver window and open the driver door.

9. Verify the scan tool Content Theft Deterrent Alarm Status parameter is Alarm.

If not Alarm

Replace the K9 Body Control Module.

If Alarm

10. Verify the P25 Power Sounder Content Theft Deterrent Alarm Module is sounding.

If the P25 Power Sounder Content Theft Deterrent Alarm Module is not sounding

Refer to Theft Deterrent Alarm Malfunction (with UTR)Theft Deterrent Alarm Malfunction (with UTP).

If the P25 Power Sounder Content Theft Deterrent Alarm Module is sounding

11. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

INCLINATION/INTRUSION SENSOR MALFUNCTION

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The Body Control Module performs various communication fault detection tests to determine if a software, hardware, or communication concern exists with the Content Theft Deterrent Sensor Module.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B165 Content Theft Deterrent Sensor Module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the B165 Content Theft Deterrent Sensor Module.

If the test lamp illuminates

5. Vehicle OFF, arm the content theft deterrent system.

6. Test for greater than 4.5 V between the serial data circuit terminal 4 and ground.

If 4.5 V or less

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the serial data circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the serial data circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If greater than 4.5 V

7. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

8. Test for less than 1 V between the B165 Content Theft Deterrent Sensor Module serial data circuit terminal 4 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

9. Vehicle OFF, connect the harness connector at the B165 Content Theft Deterrent Sensor Module. Disconnect the harness connector at the S48B Multifunction Switch - Overhead Console. It may take up to 2 minutes for all vehicle systems to power down.

10. Test for less than 10 Ω between the ground circuit terminal 2 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

11. Vehicle OFF, connect the harness connector at the S48B Multifunction Switch - Overhead Console. Disconnect the harness connector at the B165 Content Theft Deterrent Sensor Module, vehicle in Service Mode.

12. Test for less than 1 V between the circuit terminal listed below and ground: Control circuit terminal 2

Signal circuit terminal 4

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

13. Connect a 3 A fused jumper wire between the control circuit terminal 2 and B+.

14. Verify the intrusion/inclination sensor disable LED is illuminated.

If the indicator is not illuminated

1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, replace the open/high resistance in the circuit.

If less than 2 Ω, test or replace the S48B Multifunction Switch - Overhead Console.

If the indicator is illuminated

15. Test for infinite resistance between the signal circuit terminal 1 and ground.

If less than infinite resistance

1. Vehicle OFF, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.

2. Test for infinite resistance between the signal circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, test or replace the S48B Multifunction Switch - Overhead Console.

If infinite resistance

16. Test for less than 10 Ω between the signal circuit terminal 1 and ground with the intrusion/inclination sensor disable switch pressed.

If 10 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.

2. Test for less than 2 Ω in the signal circuit end to end.

If 2 Ω or greater, replace the open/high resistance in the circuit.

If less than 2 Ω, test or replace the S48B Multifunction Switch - Overhead Console.

If less than 10 Ω

17. Replace the B165 Content Theft Deterrent Sensor Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

THEFT DETERRENT ALARM MALFUNCTION (WITH UTR)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The content theft deterrent system uses the power sounder to provide an audible alert when in the alarm mode. The power sounder receives a constant B+ and ground. The Body Control Module commands the power sounder via serial data. The power sounder is also equipped with a battery backup. If the power sounder is disconnected while the vehicle is OFF, the battery backup will allow the power sounder to sound the audible content theft deterrent alert.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the P25 Power Sounder Content Theft Deterrent Alarm Module. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Vehicle in Service Mode.

4. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the P25 Power Sounder Content Theft Deterrent Alarm Module.

If the test lamp illuminates

5. Vehicle OFF, arm the content theft deterrent system.

6. Test for greater than 4.5 V between the serial data circuit terminal 3 and ground.

If 4.5 V or less

1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the serial data circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the serial data circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If greater than 4.5 V

7. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.

8. Test for less than 1 V between the P25 Power Sounder Content Theft Deterrent Alarm Module serial data circuit terminal 3 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

9. Test or replace the P25 Power Sounder Content Theft Deterrent Alarm Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for Body Control Module replacement, programming, and setup

THEFT DETERRENT ALARM MALFUNCTION (WITH UTP)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The content theft deterrent system uses the security to provide an audible alert when in the alarm mode. The security siren is controlled by the Body Control Module though the security siren relay. The security siren relay coil and switch each receiver B+ at all times. When the content theft deterrent system determines that an alarm condition exists, it will pulse the security siren by grounding the security siren relay control circuit. This will create an electromagnetic field in the relay and pull the relay switch closed, applying B+ to the security siren, causing it to sound.

Reference Information

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Theft Systems Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF and all vehicle systems OFF, disconnect the KR101 Security Siren Relay, vehicle in Service Mode.

2. Verify a test lamp illuminates between the B+ circuit terminals listed below and ground: Terminal 2

Terminal 3

If the test lamp does not illuminate

Test or replace the X50A Fuse Block - Underhood.

If the test lamp illuminates

3. Test for less than 1 V between the control circuit terminal 4 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

4. Vehicle OFF.

5. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.

6. Completely lower the driver door window and close all vehicle doors. Arm the content theft deterrent system by locking the doors with the keyless entry transmitter. Wait 30 seconds for the content theft deterrent system to arm.

7. Without disarming the system, reach in through the open driver window and open the driver door.

8. Verify the test lamp turns ON and OFF.

If the test lamp is always ON

1. Disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module.

If the test lamp is always OFF

1. Disconnect the harness connector at the K9 Body Control Module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

If less than 1 V

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the K9 Body Control Module.

If the test lamp turns ON and OFF

9. Disconnect the harness connector at the P4 Security Siren.

10. Test for less than 10 Ω between the ground circuit terminal B and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

11. Connect the harness connector at the P4 Security Siren.

12. Connect a 10 A fused jumper wire between the B+ circuit terminal 3 and the control circuit terminal 4.

13. Verify the P4 Security Siren is sounding.

If the P4 Security Siren is not sounding

1. Disconnect the harness connector at the P4 Security Siren.

2. Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance

3. Test for less than 2 Ω in the control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, test or replace the P4 Security Siren.

If the P4 Security Siren is sounding

14. Test or replace the KR101 Security Siren Relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Refer to Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)

Refer to Control Module References for Body Control Module replacement, programming, and setup

DESCRIPTION AND OPERATION

THEFT SYSTEMS DESCRIPTION AND OPERATION

When armed, the content theft deterrent system is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 30 seconds when an unauthorized vehicle entry is detected. If equipped, a siren will also be activated. However, the content theft deterrent system does not affect engine starting.

An unauthorized entry can be any of the following with the content theft deterrent system armed:

When any door is opened without using the UNLOCK command from a keyless entry transmitter Unauthorized entry into the underhood area

Unauthorized entry into the rear compartment Unauthorized access to the charge port

Disconnection of the charge cord when charging

After a battery reconnect, if the battery was disconnected with the content theft deterrent system armed

The components of the content theft deterrent system are: Body Control Module (BCM)

Remote Control Door Lock Receiver Security Indicator

Door Ajar Switches

Rear Compartment Ajar Switch Hood Ajar Switch

Charge Port Door Ajar Switch External siren, if equipped

Arming the Content Theft Deterrent System

Use the following procedure in order to arm the system:

1. Place the shift lever in P (park).

2. Turn the vehicle OFF.

3. Open any door.

NOTE: The system is not armed if the doors are locked manually; the power door lock switch or remote keyless entry transmitter must be used to arm the content theft deterrent system.

4. Lock the doors with the power door lock switch or the LOCK button on the transmitter. The system is in standby mode and will not start the arming timer until all doors are closed.

5. The system will begin the arm sequence immediately after the last door is closed. If the keyless entry transmitter is used to arm the system after the vehicle doors are closed, the arm sequence will begin as soon as the LOCK command is received from the transmitter.

6. Immediately pressing the LOCK button a second time will bypass the delayed arming function and immediately arm the system.

Locking the Vehicle Without Arming the Content Theft Deterrent System

Locking the vehicle may be accomplished without arming the content theft deterrent system. Use of the manual door locks or using the key to lock the doors will lock the vehicle, but will not arm the content theft deterrent system.

Disarming an Armed System/Silencing an Alarm

If system arming has been requested by the power door lock switch or the keyless entry transmitter, it must be disarmed.

NOTE: Disconnecting the battery or pulling fuses does not disable the arm mode, since the BCM stores the content theft deterrent alarm status in memory.

To disarm the content theft deterrent system in standby mode, perform one of the following: Press either power door unlock switch.

Press the UNLOCK button on the keyless entry transmitter.

To disarm the content theft deterrent system in the armed mode (non-event) or when activated (during an alarm event):

Press the UNLOCK button on the keyless entry transmitter.

Press the vehicle ON/OFF switch with a valid key in the vehicle

Content Theft Deterrent Circuit Description

The following is a description of each component used in the content theft deterrent system:

Body Control Module

The content theft deterrent system is an internal function of the BCM which utilizes serial data and various switch inputs information to perform content theft deterrent functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps. The BCM has 4 basic modes (disarmed, standby, armed, and alarm) for operating the content theft deterrent system. The different modes are described below.

1. The BCM has the content theft deterrent system in a disarmed mode until the following conditions are detected:

Vehicle OFF.

Doors locked by either the power door lock switch or the LOCK button on the transmitter.

2. The BCM enters the standby mode when the above conditions are detected. If a door was already opened when the arm mode was requested, the standby mode does not start the timer until the last door is closed.

3. When the last door is closed, a 30 second timer is activated. Once the timer has expired, the BCM enters the armed mode. After this delay, any forced entry activates the alarm mode.

4. When the BCM detects a forced entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 30 seconds. If equipped, a siren will also be activated. This is followed by a three minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.

Remote Control Door Lock Receiver

The keyless entry system can arm and disarm the content theft deterrent system. When the remote control door lock receiver receives a door lock or unlock signal from the transmitter, the remote control door lock receiver sends a message to the BCM via serial data to perform the appropriate arm/disarm functions.

Security Indicator

The security indicator is illuminated in the instrument panel. The content theft deterrent system uses the security indicator to inform the driver of system status prior to arming.

Door Ajar Switches

The content theft deterrent system uses the door ajar switches as a status indicator to activate the alarm. The door ajar switches are monitored by the body control module via a discrete input from each door ajar switch. If the BCM receives a signal indicating a door is opened when the content theft deterrent system is armed, the BCM activates the alarm.

Hood Ajar Switch

The content theft deterrent system uses the hood ajar switch as a status indicator to activate the alarm. The BCM monitors the hood ajar switch via a discrete input from the switch. If the BCM receives a signal indicating the hood has been opened when the content theft deterrent system is armed, the BCM activates the alarm.

Rear Compartment Ajar Switch

The content theft deterrent system uses the rear compartment ajar switch as a status indicator to activate the alarm. The BCM monitors the rear compartment ajar switch via a discrete input from the switch. If the BCM receives a signal indicating the rear compartment has been opened when content theft deterrent system is armed, the BCM activates the alarm.

Charge Port Door Ajar Switch

The content theft deterrent system uses the charge port door ajar switch as a status indicator to activate the alarm. If the BCM receives a signal indicating the charge port door has been opened when content theft deterrent system is armed, the BCM activates the alarm. Additionally, if the BCM receives a message that the charge port cord is disconnected from the vehicle while the content theft deterrent is armed, the BCM will active the alarm.

Inputs

The BCM monitors the following inputs for content theft deterrent: The door ajar switches

The keyless entry transmitter LOCK/UNLOCK buttons; a message from the Remote function receiver module/Remote control door lock receiver

The immobilizer status - The BCM uses the immobilizer status for disarming the system or silencing an alarm when the correct vehicle key is used to start the vehicle

The rear compartment ajar switch The hood ajar switch

The charge port door ajar switch

Outputs

The BCM controls the following for content theft deterrent:

The horn relay

The exterior lamps Siren, if equipped

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